Safety attachment for punch-presses.



. H. E} MARVEL.

SAFETY ATTACHMENT FOR PUNCH PRESSES.

. APPLICATION FILED MAR. 15, 1917- 11 g i; Patented Aug. 28, 191?.

3 SHEETS-SHEET 1.

INVENTOR ATTORNEYS H. E. MARVEL.

SAFETY ATTACHMENT FOR PUNCH PRESS ES.

APPLICATION FILED MAR. 15. 1917.

Patented A11 28, 191?.

3 SHEETS-SHEET 2.

m ygm W INVENTOR "I 5 H. E. MARVEL.

SAFETY ATTACHMENT FOR PUNCH PRESSES.

APPLICATION FILED MAR. 15. 1917.

Patented Aug. 28, 1917.

SSHEETS-SHEET 3.

1., M T A INVENTOR A mw iwwrwa srs ar a ri HARVEYE. MARVEL, or WARSAW, INDIANA.

To all whom it may concern: i Be it known that IMHAIRVEY E. MARVEL, residing at \Varsangin the county of Kosc usko and State of Indiana,,have invented a a new; and Improved Safetyrittachment for ;Punch-Presses,',of which the following is a a: specification. q W As iSJVGll known toHtho-se familiar with theoperation of punchrand die presses that I) in Working the press, the operator, by carelessness orinattention to the running of the pr'ess, frequently trips the press whilefeeding the stock to or removing it from the" press, andin consequence a large per cent. of is: fingers and hands of punch or die p'ressoperators are thereby ser ously lIlJLll'GCl.

The primary object ofmy invention is to a provide simple, 1neXpens1ve and easily manipulated safety devices designed for being '41.. quickly adjusted and automaticallyreleased from theoperative shaftbeforei feeding the stock to or removing it from the press bed,

so that accidental tripping of the press and consequentdanger of injury to the hands of v .5 the operatorare positively overcome. H ,l\4[y,1nvention,.1n its generic nature, comprehends safety devicesin the natureof improved clutch mechanism adapted forbeing cooperatively connected with theoperating before putting the stock in positionto be punched or embossed and for automatically disconnecting the said driver from dI'lV, lng engagement with the operating shaft,

f and after the stock is placed in the desired .position, andto instantly shift the parts whereby to put them back into position for being again actuated by thedriver or power wheel. 4 I) tion, inthe nature of clutchmechanism, in

which detent devices are included, which, when initially set by the operator tend to a keep the driver or fly wheel out of driving contact with the operating shaft until the parts are further adjusted by'the operator for automatically effecting a readjustment ,of:such.parts for restorlng the operating I shaft into active condition.

arrow at and with the locking shaftvofjhe press andthedriver therefor,

, a. r, ,5, excepting that th Another object, of my invention, is to pro 'videc'ertain. improved features of construe- 7 With other objects in view that will heretute my safetymechanism for punch or die' SAFETY ATTACHMENT FOR PUNCH-PRESSES.

Specification of Letters Patent. Patentgd Aug; 2%, 191% Application filed Mar-ch 15, 1917. 1 Serial No. 155,128. i

detail, specifically pointed out in the, appended clalms and illustrated in the acconi' panylngfdrawings, in which:

Figure 1 is a perspective View of so much I of a punch press as is necessary to illustrate the general application of my f safety it dev ces. w Fig. 2 1s a perspective view of my inventionas operatively applied, the fly oi: power A 3 is a vertical section of my safety devices or clutch mechanism taken substantially onthe line 3-3 on Fig. 6, the power or fly Wheel being shown at the loosely running position and the shaft as held sta tionary. t t h t I 1 Fig. 4: 1s a similar section, the wheel being shown as coupled with the shaft and the I parts adjusted to cause .the shaftto begii'i to turn with the Wheel.

Fig.5 is an inverted plan view, the parts be ng shown in the operative position when .the shaft is turning in the direction of the bar, hereinafter described, about to engage with a cooperating tripping clutch, to release ,the shaft from the fly wheel. 1 h h i t i Fig. 6 is a horizontal section takensubstantially on the line 6+6 on Fig. 2,10010 ing in the direction of the arrow Z), the tripping clutch being shownas having released the locking bar from the fly wheel.

Fig. 7 is a detail cross section on the line 7. 70nFig.3. I t t 1 Fig. 8 is an inverted plan similar toFig. safety dog a ldfthe released bar, hereinafter referred to are aboutto be moved back to the normal or first position. 7 y w Fig- 9 is a view that illustrates, in perspective, the several parts that constitute my safety clutch mechanism, the parts being separated. r

In the accompanying. drawings, 1. have shown enough of the punch press to locate the operative parts that constitute my safety clutch mechanism and referring more particularly to Fig. 1, 1. indicated the. base, 2 the machine bed, 3 the sides or standards and 4 the bearings at. the upper front edges of the said side standards in which the operating shaft 5 is journaled, it, being under stood that the usual punch orsta nping,

the fly or power wheel 7 and the said hub "atone end, on" aflstud '90 held on a bracket carries a clutch memberythat ishereinafter termed the locking bar 8, said bar belng slidably mountedinaasOcket'SO' formed in the said hub 111811113933 ancbnormally forced" outwardly to its' operative osition, see Fig.- 5, bya-spring8li Bar 8 also has'a' beveled notch 82 its-"under ,edge,-the'reas'on for which'will presently-appear.

' clutch member 9 is pivot-allymounted,

adjacent'tlie h'ubb on the operating shaft ;and the front end of the said trip clutch member, which hasalimitedvertical'swing,

beve led tongue-9'2, the purpose of which ""will also presently ap'pearfi 39* designateszv pullrod, that connects has-a stop shoulder 9.1 at theiinnerlend of' -wit1r an aperturedear 9 pendent from the member-9 ahd which joins with a hand lever shown in Fig! 1. i

- "1'4: denotes afsafety dog'or lever,'the lllIlGlf *end of-whichis pivotally mounted on a stud 39 located on the side standard, as is-clearly pin 15 located in a'br acket'lf) on the'fraine "(standard and the sai'dsafetylever, which swings m'the horizontal plane, has its front end-extended under th'ehub 6 on the shaft I I I l I i 5'-and the said endform'ed with arsegmental cam like member 16- which, at times, coacts "detail."

with'a" tripper pawl 17 mounted on the fly CO1'11lGCt1OD"W1tli the accompanying drawlugs, the complete construction, the general or driver wheel 7 and presently described in The safety dog" lever 14 is secured,"

'througha connection 18,-;with a release barf "19, one end of' wh ch passes through a su1table aperture'30, in the side standard 3, as

Hwhich it will be seen that the outer end of" the bar 19 extends under and locks-the trip clutch I member up to its normal or uppermost position andHvith its beveled-tongue 92 located for being engaged by the 'notch 82 in the under side of the lock bar 8, 'asthe 1 shaft-5, with the 'wheel' locked therewith, re- 1 volves' in the"direction-of the arrow'c on Flgj 7* and by reason thereof causes the lock and thereby moves into a locked engagebar 8 to pull inwardly within its 'socket 80," to the position'shownin dotted lines 011mg:

rn'ent' with the stop shoulder 9l'to hold-the shaft 5 "from rotation, as thewheel 7 by reason 'of 'having beenreleased"from "the I lock bar-*8 nowturnsdoosely *on the said shaft 5, it being understoodthat' suchrelalandfi l, it will be seen, that the inner face of the fly or drive wheel has a series, preferthe way of the pawls with the wheel-7.

' "After shifting theparts controlled bythe ably '8, of circumferer'itially arranged clutch sockets 22 into any one of which the clutch bar 8 projects during the operation of clutching the shaft 5 to turn With the wheel 7, and with each of the said sockets 22 alines a-transverseaperture 23 in each of which is mounted a pusher pin 24.

One of the pivoted arms orpawls 17,

n'roifnted on the-wheel 7 as hereinbefore referred to, is provided :for coacting with each pusher pin and the -said pawls 17" are so mounted that when swung in the direction, 11161091911 by the arrow r err Fig. l (which shows the wheel connected to t he 'shaft by V reason'of the-locking bar 8-extendinginto the 'socket'22), the said pawl 1'7 swings to the position shownin Figi which forces the pin in the direction of thearrowy and thereby pushes the clutch or look bar- 8 back intoits socket89*and against the te'nsion of its spring'Sl and also out of a clutched relal tion with the wheel '7, thedatter being thus released toruir freely on'the sha-ft 5.

5 As before noted, the safety dogor lever 14 mal position, as-presently explained, the

safety lever leis pulled over with such bar to the position shown in Fig. 8, the said dog -1tbeing-limite'd in its movement, to-thepositionshown," by a stop pin 26.

" 60 designates" a lug roller on the shaft hub t for shifting the safety dog or-leverl l in a mannerpresently explained.

From the foregoing descrlptlontaken in operation and the advantages of my invention will be-apparent.

Inoperating'ni'y 'sa'fety-devices, the'operator-ya f ter he has placed the stock in the die, presses down the hand lever 28,'at' the'left side -of the machine; which, through its con- In pulling the release bar over, as stated,

the-safety-dog or lever is pulled over to the -position shown in Figs-8 and out of 17,a sthey move-around lever 28, the operator-Width his ri ht--hand,

stop bar sand thereby, trips the press and allOWs'the shaft Sand the" wheel 7 to re- "has carn segment 16, and-sincethe-said V pawl '14 is connected with therelease bar 19, when the-said bar-19is returned to the nordepresses a lever 39] that joins, by fiexible connectio'n's 89 with the-trip clutch 9 and pullsthe saidleven"down 'to the position shown in Figs 4:"andout of thepathofthe *volve together and effect a working action mes-Me ofthe press. h 1

After the shaft and the wheel arestarted,

pressure on the lever 28 isreleased and in making a revolution, the stud roller 60 on the shaft hubt engages the safety lever 14,

swings it over to the position shown in Fig.

6, and thereby brings the cam segment 16 in the path of the pivoted pawl 17 on the now turning wheel, and as" the said pawls 17 engage the cam 16, they are rocked to the position shown in Fig; 3 which pushes the pinfinwardly and forces the clutch bar 8 from engagement with the wheel and thereby allows the wheel 7 to now run freely, as the rotation of the shaft is again retarded by the lock bar 8 again contacting withthe shouldered end of the pawl 14' which latter, by reason of the release of lever 39 is forced back to its uppermost position in the path of the clutch or lock lever '8, see Fig. 8.

By reason of the safety lever 14: being attached to the release bar 19in the manner stated, it; follows that as the lever 14 is swung over to the position shown in Fig. 6, the release bar is likewise pulled in the same direction andas it thus moves, its beveled edge 1 1 engages the trip clutchmember 9 1 and forces it up and holds it to the position shown in Fig. 3, the advantage of the latter operation being apparent for the reason that if an operator is careless and holds the lever 39 and the trip clutch member 9 down too long, the actioirof the press puts the trip member back to its proper place, which makes the press safe for a careless operator.

While the specific cooperative arrange ment of the parts shown and described present a practical application of my invention,

it is understood I do not limit myself to the details shown, since they may be readily varied or modified without departing from my invention as set out in the appended claims.

What I claim is:

1. Safety means for punch presses and the like, comprising in combination with the operating shaft and a power wheel loosely mounted thereon; mechanism normally tending to lock the shaft to turn with the power wheel, a detent for holding the said mechanism out of locked engagement with the wheel, manually actuated means for tripping the said detent whereby to permit the said mechanism to clutch the shaft to the wheel and further means actuated by the rotation of the wheel for shifting the said locking mechanism out of operative engagement with the wheel.

2. A rotary shaft, a power wheel loosely mounted thereon, clutch mechanism cooperating with the shaft and the wheel and normally out of interlocked engagement with the power wheel, the said mechanism including a locking element and means tending to normally move thesaid element into a locked engagement with the power wheel, a manually released detent that holds the locking element to its wheel released position and adapted when tripped to effect the interlocking of the wheel and the shaft, whereby to rotate the shaft, and other means operated by the rotation of the shaft and the wheel for shifting the clutch mechanism to thereby release the shaft and the wheel from interlocked engagement.

3. In a mechanism ofthe character stated, a rotary shaft, a power wheel loosely'mounted thereon, clutch mechanism thatholds the wvlieel locked with the shaft, whereby to cause the wheel to rotate with the shaft to a predetermined degree and means operated by the rotat1on of the said wheel for shift ingthe clutch devices from engagement with crating shaft and the power wheel loosely mounted thereon; of an automatic operating clutch mechanism for holding the wheel fixed on the shaft, means operated by the rotating wheel for shifting the clutch mech anism to release the wheel from locked en- ..gagement with the shaft, clutch tripping devices, manually operated means for setting the tripping devices and other means on the wheel for engaging the said tripping devices, whereby to shift the setting devices to restore the clutched relation of the. wheel and the shaft. .5. In a mechanism of the character stated, a rotary shaft, a power wheel, means for holding the said shaft and wheel interlocked for a predetermined period and that automatically releases the wheel from an interlocked connection with the shaft at the end of such predetermined period and hand controlled means for restoring the said connections in condition for again effecting the interlocked relation of the shaft and the wheel.

6. In a mechanism of the character stated, a rotary shaft, a power wheel, means for holding the said shaft and wheel interlocked for a predetermined period and that automatically releases the wheel from an interlocked connection with the shaft at the end of such predetermined period and hand controlled means for restoring the said connections in position for again effecting the interlocked relation of the shaft and the wheel, said interlocking means including a clutch member on the shaft normally held for interlocking with the wheel, a shifter bar that engages the said member and means on the wheel that engages the said bar and shifts for moving the clutch member out of interlocked engagement with the: wheel,

"a rotary'shaft, a power wheel, means for 'holding the said'shaft and wheel interlocked 1 for a predetermined-period and-thatauto- 15) matically releases the wheel from an interlocked connection with the shaft at the end of suchpredetermined period and hand con *trblled means for restoring thesaid connec j clutch member on the shaft normally held for interlocking with the wheel, a shifter bar thatengages the said member and means 20 i on the wheel that engages the'said bar and shifts it for moving the clutch member out ofinterlocked engagement with the wheel;

tothereby cause the wheel torotate loosely on the shaft, a'stop bar, a stop on the wheel for engaging the stop banand ma-n'ually operatedqneans for setting the stop bar in position for being engagedby the wheelstop and otlier manually actuated meansfor shifting the stop bar out of the path of movement of* the stop on the wheel andfurthermeans onthewheelfor moving the said-stop out of operative position when the 1 manually controlled means is released. 8. The-'combination'with a shaft, a con-- tinuously rotating power wheelloosely *mounted on the shaft, clutch mechanism "cooperative with the shaft and the wheel, manually operated means for adjusting the co ies of this patentniay b'e obtained for aasa'pm said: mechanism whereby to pi ovide for placing the said mechanism into operative connection-"with the shaft and Wheel, and means whereby to cause the shaft to rotate with the wheel, also-cooperative with the shaft and wheel, foreffecting arelease of the wheel froin the shaftafter the wheel has rotated to a predetermined-extent.

9. Ina mechanism of the character-stated,

" a rotary shaft, a power wheel loosely 'mounted 'on the shaft,= a locking bar onthe shaft, means, tending to normally== project said bar toward the wheel, a trip device that normally engages the look bar and-holds it back againstthe means that-tend to push said bar outward the said wheel having h clutch seats for receiving the lock bar when the 'trip lever is disengaged therefrom, a safety-dog having a cam portion, anda re- -lease bar that joins with the safety dog and which coacts with the trip bar to restoresaid i331 toa' normal or locked bar engaging position, means on the shaft that engage the safety dog forrestoring thesaid release bar to the position stated; and for setting the said dog tobring its'cam portion to an operative position, pins slidably mounted on the wheel 1 and adapted for engaging the clutched ends of the lock bars to'move the said bars out of a clutch connection-with the wheel, a pusher ,pivotallymOunted on i thewheel 'that engages the slidable pins and which have membersithat engage the cams on the safety dog as the wheel revolves, to thereby actuate the pivoted pushers for shifting thelock bar releasing pins.

i I HARVEY MARVEL five cents each; by addressing the Commissioner of Patents, .Washin'gtbn,'D.0. 

